| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Janes, Dustin W.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2016Orthogonally Spin-Coated Bilayer Films for Photochemical Immobilization and Patterning of Sub-10-Nanometer Polymer Monolayerscitations
- 2016Marangoni instability driven surface relief grating in an azobenzene-containing polymer filmcitations
- 2015Modulating Solubility and Enhancing Reactivity of Photo-Cross-Linkable Poly(styrene sulfonyl azide-alt-maleic anhydride) Thin Filmscitations
- 2015Surface tension driven flow in a low molecular weight photopolymer
- 2015Bidirectional Control of Flow in Thin Polymer Films by Photochemically Manipulating Surface Tensioncitations
- 2014A photochemical approach to directing flow and stabilizing topography in polymer filmscitations
- 2014Precision Marangoni-driven patterningcitations
- 2014Surface energy gradient driven convection for generating nanoscale and microscale patterned polymer films using photosensitizerscitations
- 2013Directing convection to pattern thin polymer filmscitations
- 2012Patterning by photochemically directing the Marangoni Effectcitations
Places of action
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article
Surface energy gradient driven convection for generating nanoscale and microscale patterned polymer films using photosensitizers
Abstract
<p>The Marangoni effect describes how fluid flows in response to gradients in surface energy. This phenomenon could be broadly harnessed to pattern the surface topography of polymer films if generalizable techniques for programming surface energy gradients existed. Here, a near UV-visible light (NUV-vis) photosensitizer, 9,10-dibromo-anthracene (DBA), was doped into thin films of a model polymer, poly(isobutyl methacrylate). After exposure to light through a photomask and heating above the glass transition, thermolysis of photo-oxidized DBA and grafting to the polymer promoted flow of the film material into the exposed regions. This mechanism did not significantly alter the molecular weight of PiBMA or the film's glass transition temperature, but resulted in an increase in film surface energy as indicated by a decrease in water contact angle. Film height variations of 580 nm were produced using a mask with 12.5 μm features; a mask with 800 nm features was also employed to generate topographic features of corresponding width without expensive contacting equipment. Due to the broad absorbance spectra of DBA, highly accessible and/or unconventional light sources may be employed in this process; this advantage was demonstrated by patterning with sunlight. The nonspecific radical-mediated nature of the DBA grafting reaction makes this a promising approach for many classes of polymers.</p>